Fittings for metallurgical furnaces



Jan. 2, 1923. W F 1,441,1'28. E. SCHIEGIIIQS LI AL.

FITTINGS FOR METALLURGICAL FURNACES.

FILED MAY I2, I9?2.

fizwzziozzs Mung; H W .lwscjzke rill Patented Jan. 2, 1923.

EDUARD SCHIEGRIES AND MAX PASCHKE, OF DUISBURG-MEIDERICH, GilZRMANY.

FITTINGS FOR METALLURGICAL FURNACES.

Application filed May 12. 1922. Serial No. 560,387.

To all lc/mm i1- muy conic/a Be it known that we. EDL'ARD Sci-Incomes and Max lxscnitn, both subjects of Germany. and residing at l)uisburg-Meiderich, have invented certain new and useful -lmprovements in or Relating to Fittings for l\"letallurgical Furnaces. of which the following is a specification.

()ur invention relates to improvements in fittings for metallurgical furnaces. and the object of the improvements is to provide fittings which greatly resist the action ot heat and chemicals. which an be manufactured at comparatively low cost. aml which can *asily he handled. With this object in view our invention consists in making the fittings of metallurgical furnaces and their auxiliary apparatus and devices. which hitherto have been made of copper or bronze. of aluminium or its alloys. Aluminium or its alloys have the following advantages. over copper or bronze.

The outer surfaces of the aluminium or of its alloys are oxidized. Fittings subjected to oxidizing intluences when in use on blast furnaces for instance. become of course. self-oxidized. but otherwise oxidation must be artificially obtained. for instance by treating the fittings with dilute nitric acid or by directing upon them a blast of highly heated air. The layer of oxide greatly resists the action of heat and of chemicals.

'lhe low specific gravity of aluminium as compared with that of copper or bronze lowers the cost of the fittings by about twothirds.

'lhe. handling of the fittings is rendered extremely easy.

with reference to the advantage set forth above. the. invention can he used in metallurgy whenever the fittings are under high temperatures. more particularly lll blast furnaces and their auxiliary parts. such as blast twyers and their protective easing. slag twyers and easing. cooling plates and cooling beams, cooling boxes. hot blast valves and the like.

The resistance to heat is increased by covering those parts of the fittings facing thev tire with a plastic material the chief component of which is clay. before they are set in position. Experiments have shown that when. in service the surfaces of aluminium and clay in contact become so intimately cemented to each other that a destruction of the aluminium by mechanical or chemical action or by the heat appears to .be. almost precluded.

Experiments have furthermore shown that the resistance of the fittings to the actions just mentioned (and more particularly chemical action) increases with the density of the materials used in the manufacture of the said fittings. An alloy of about 87;. copper and 92% aluminium has proved particularly suitable as regards density and cost. Density may of course be increased by means of other alloys. the cost of which is however higher than the above.

Inorder that our invention be. more clearly understood several examples embodyingthe same have been shown in the accompanying drawin in which the samev letters of ref erence have been used in all the views to indicate corresponding parts. In said drawview showing a hot 'Preferably the said parts are coated with clay which when heated is intimately cemente'd to the fitting and provides a bar as against. the injurious influence of heat and chemicals. having a coating of clay In Fig. ll we have shown a hot blast v: lve comprising a tubular casing valve seats It in the form of rings titted within the easing 1/. and the valve body 1'. The rings l1 and the valve body i are made from aluminium or a suitable alloy thereof.

We claim:

1. Integral water allurgical furnaces containing metallic 2. Integral water allurg' al furnaces ium allov Integral water allurgical furnaces cooling fittings for metmade from a material aluminium.

cooling fittings for metmade from an alumincooling fittings for met made from a material Fig. shows the blast twyer 1) for metallurgical made 'from an aluminium alloy.

7. Tw ers for metallurgical furnaces made from a. material containing; metallic aluminium and having an oxidized surface.

8. Twyers for metallurgical furnaces made from a material containing metallic. aluminium and having a coating of clay.

In testimony whereof We hereunto afiix our signatures.

EDUARD sonnconms. MAX PASCHKlu. 

